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CO2 and CO Gas Sensing Properties of Submicron CoSb2O6 Wires Prepared by a Colloidal Method

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Submicron CoSb2O6 wires were prepared by a non-aqueous colloidal method, using cobalt nitrate, antimony trichloride, dibutylamine and ethyl alcohol. Microwave radiation was used for solvent evaporation, producing a solid precursor material. X-ray powder diffraction, performed on calcined samples, revealed that single-phase CoSb2O6 was produced at 500 °C. CoSb2O6 wires, with length between 4 and 17 μm were observed by scanning electron microscopy (SEM). The observation by transmission electron microscopy (TEM) revealed that the surface of CoSb2O6 wires was covered by sharp and rounded points. By this technique, an average diameter of 170 nm was measured. CO2 and CO gas sensing characterization was performed on thick films made with the as-prepared CoSb2O6 powder. The electrical measurements were performed in alternating current (AC), at 200 and 300 °C. At 200 °C, a significant variation of the magnitude of the impedance (|Z|) was registered in both gases. However, the best results were obtained at 300 °C, using a frequency of 100 kHz. The analysis of the results indicated that the gas sensing performance was better in carbon monoxide.
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Document Type: Research Article

Publication date: 2012-01-01

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